Pedosphere 4(3): 193--200, 1994
ISSN 1002-0160/CN 32-1315/P
©1994 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| A modelling stndy of potential evapotranspiration and the estimation of Chinese soil moistnre regimes |
| LIU Duo-Sen and WANG Zong-Sheng |
| Instttute of Soil Science, Academia Sinica, P. O. Box 821, Nanjing 210008 (China) |
| ABSTRACT |
Based on the conception of fluid mechanics, the paper propounds a model for monthly potential evapotranspiration ETi (mm):
where i is the number of a month, Pi the mean monthly atmospheric pressure (hPa), ti the mean monthly air temperature (℃), di the number of days in the month, Ui the mean monthly wind velocity measured at height 10-12 m (m/s), woi the saturated water vapour pressure at ti (mmHg, 1 mmHg=133.322 Pa), and hi the mean monthly relative humidity. The annual aridity K is:
where ra is the mean annual precipitation (mm). Based upon the data of 669 sites in China during 1951-1980, the relations among the soil moisture regime, the vegetation and the value of K may be illustrated as follows:
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| Key Words: aridity, evapotranspiration, modelling, moisture regimes |
| Citation: Liu, D. S. and Wang, Z. S. 1994. A modelling stndy of potential evapotranspiration and the estimation of Chinese soil moistnre regimes. Pedosphere. 4(3): 193-200. |
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